Plant Molecular Biology

, 69:463

Interaction of light and hormone signals in germinating seeds


  • Mitsunori Seo
    • RIKEN Plant Science Center
  • Eiji Nambara
    • Department of Cell & Systems BiologyUniversity of Toronto
  • Giltsu Choi
    • Department of Biological SciencesKAIST
    • RIKEN Plant Science Center

DOI: 10.1007/s11103-008-9429-y

Cite this article as:
Seo, M., Nambara, E., Choi, G. et al. Plant Mol Biol (2009) 69: 463. doi:10.1007/s11103-008-9429-y


Seed germination is regulated by several environmental factors, such as moisture, oxygen, temperature, light, and nutrients. Light is a critical regulator of seed germination in small-seeded plants, including Arabidopsis and lettuce. Phytochromes, a class of photoreceptors, play a major role in perceiving light to induce seed germination. Classical physiological studies have long suggested the involvement of gibberellin (GA) and abscisic acid (ABA) in the phytochrome-mediated germination response. Recent studies have demonstrated that phytochromes modulate endogenous levels of GA and ABA, as well as GA responsiveness. Several key components that link the perception of light and the modulation of hormone levels and responsiveness have been identified. Complex regulatory loops between light, GA and ABA signaling pathways have been uncovered.


Abscisic acid Gibberellin Phytochrome Seed germination

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© Springer Science+Business Media B.V. 2008